主题：自动编号

比如代码

Select e.DataCol.Name
    Case "订单编号"
        If e.DataRow.IsNull("订单编号") Then
            e.DataRow("生产编号") = Nothing
        Else
            Dim lb As String = e.DataRow("订单编号")

            lb = lb.split("-")(0).SubString(2)

            If e.DataRow("生产编号").StartsWith(lb) = False '如果单据编号前缀不符
                Dim max As String
                Dim idx As Integer
                max = e.DataTable.Compute("Max(生产编号)","订单编号 = '" & e.DataRow("订单编号") & "' And [_Identify] <> " & e.DataRow("_Identify")) '取得该类别的最大编号
                If max > "" Then '如果存在最大编号
                    idx = CInt(max.Substring(lb.length+1,3)) + 1 '获得最大编号的后三位顺序号,并加1
                Else
                    idx = 1 '否则顺序号等于1
                End If
                e.DataRow("生产编号") = lb & "-" & Format(idx,"000")
            End If
        End If
End Select